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f1717362 | 1 | /* Copyright (C) 2015-2016 Free Software Foundation, Inc. |
65cb1e66 | 2 | Contributed by Sebastian Huber <sebastian.huber@embedded-brains.de>. |
3 | ||
4 | This file is part of the GNU Offloading and Multi Processing Library | |
5 | (libgomp). | |
6 | ||
7 | Libgomp is free software; you can redistribute it and/or modify it | |
8 | under the terms of the GNU General Public License as published by | |
9 | the Free Software Foundation; either version 3, or (at your option) | |
10 | any later version. | |
11 | ||
12 | Libgomp is distributed in the hope that it will be useful, but WITHOUT ANY | |
13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS | |
14 | FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
15 | more details. | |
16 | ||
17 | Under Section 7 of GPL version 3, you are granted additional | |
18 | permissions described in the GCC Runtime Library Exception, version | |
19 | 3.1, as published by the Free Software Foundation. | |
20 | ||
21 | You should have received a copy of the GNU General Public License and | |
22 | a copy of the GCC Runtime Library Exception along with this program; | |
23 | see the files COPYING3 and COPYING.RUNTIME respectively. If not, see | |
24 | <http://www.gnu.org/licenses/>. */ | |
25 | ||
26 | /* This is the RTEMS implementation of the thread pool management | |
27 | for libgomp. This type is private to the library. */ | |
28 | ||
29 | #ifndef GOMP_POOL_H | |
30 | #define GOMP_POOL_H 1 | |
31 | ||
32 | #include "libgomp.h" | |
33 | #include <sys/lock.h> | |
34 | #include <string.h> | |
35 | ||
36 | /* For each scheduler instance there may be a thread pool reservoir | |
37 | to limit the number of thread pools used by the OpenMP master threads of this | |
38 | scheduler instance. The reservoirs are configured via the | |
39 | GOMP_RTEMS_THREAD_POOLS environment variable. */ | |
40 | struct gomp_thread_pool_reservoir { | |
41 | gomp_sem_t available; | |
42 | gomp_mutex_t lock; | |
43 | size_t index; | |
6e723739 | 44 | int priority; |
65cb1e66 | 45 | struct gomp_thread_pool *pools[]; |
46 | }; | |
47 | ||
48 | struct gomp_tls_rtems_data { | |
49 | struct gomp_thread_pool_reservoir *thread_pool_reservoir; | |
50 | }; | |
51 | ||
52 | extern struct gomp_thread_pool_reservoir **gomp_thread_pool_reservoirs; | |
53 | ||
54 | extern __thread struct gomp_tls_rtems_data gomp_tls_rtems_data; | |
55 | ||
56 | static inline struct gomp_thread_pool_reservoir * | |
57 | gomp_get_thread_pool_reservoir (void) | |
58 | { | |
59 | struct gomp_thread_pool_reservoir *res = | |
60 | gomp_tls_rtems_data.thread_pool_reservoir; | |
61 | ||
62 | if (res == NULL && gomp_thread_pool_reservoirs != NULL) | |
63 | { | |
64 | struct gomp_thread *thr = gomp_thread (); | |
65 | thr->thread_pool = gomp_malloc_cleared (sizeof (*thr->thread_pool)); | |
66 | res = gomp_thread_pool_reservoirs[_Sched_Index ()]; | |
67 | gomp_tls_rtems_data.thread_pool_reservoir = res; | |
68 | } | |
69 | ||
70 | return res; | |
71 | } | |
72 | ||
73 | static inline struct gomp_thread_pool * | |
74 | gomp_get_own_thread_pool (struct gomp_thread *thr, unsigned nthreads) | |
75 | { | |
76 | struct gomp_thread_pool *pool = thr->thread_pool; | |
77 | if (__builtin_expect (pool == NULL, 0)) | |
78 | { | |
79 | pool = gomp_malloc_cleared (sizeof (*pool)); | |
80 | pool->threads_busy = nthreads; | |
81 | thr->thread_pool = pool; | |
82 | } | |
83 | return pool; | |
84 | } | |
85 | ||
86 | static inline struct gomp_thread_pool * | |
87 | gomp_get_thread_pool (struct gomp_thread *thr, unsigned nthreads) | |
88 | { | |
89 | struct gomp_thread_pool *pool; | |
90 | ||
91 | if (__builtin_expect (thr->thread_pool == NULL, 0)) | |
92 | pthread_setspecific (gomp_thread_destructor, thr); | |
93 | ||
94 | if (nthreads != 1) | |
95 | { | |
96 | struct gomp_thread_pool_reservoir *res = | |
97 | gomp_get_thread_pool_reservoir (); | |
98 | if (res != NULL) | |
99 | { | |
100 | gomp_sem_wait (&res->available); | |
101 | gomp_mutex_lock (&res->lock); | |
102 | pool = res->pools[--res->index]; | |
103 | gomp_mutex_unlock (&res->lock); | |
104 | pool->threads_busy = nthreads; | |
105 | thr->thread_pool = pool; | |
106 | } | |
107 | else | |
108 | pool = gomp_get_own_thread_pool (thr, nthreads); | |
109 | } | |
110 | else | |
111 | pool = NULL; | |
112 | return pool; | |
113 | } | |
114 | ||
115 | static inline void | |
116 | gomp_release_thread_pool (struct gomp_thread_pool *pool) | |
117 | { | |
118 | struct gomp_thread_pool_reservoir *res = | |
119 | gomp_tls_rtems_data.thread_pool_reservoir; | |
120 | if (res != NULL) | |
121 | { | |
122 | gomp_mutex_lock (&res->lock); | |
123 | res->pools[res->index++] = pool; | |
124 | gomp_mutex_unlock (&res->lock); | |
125 | gomp_sem_post (&res->available); | |
126 | } | |
127 | } | |
128 | ||
6e723739 | 129 | static inline pthread_attr_t * |
130 | gomp_adjust_thread_attr (pthread_attr_t *attr, pthread_attr_t *mutable_attr) | |
131 | { | |
132 | struct gomp_thread_pool_reservoir *res = gomp_get_thread_pool_reservoir (); | |
133 | if (res != NULL && res->priority > 0) | |
134 | { | |
135 | struct sched_param param; | |
136 | int err; | |
137 | if (attr != mutable_attr) | |
138 | { | |
139 | attr = mutable_attr; | |
140 | pthread_attr_init (attr); | |
141 | } | |
142 | memset (¶m, 0, sizeof (param)); | |
143 | param.sched_priority = res->priority; | |
144 | err = pthread_attr_setschedparam (attr, ¶m); | |
145 | if (err != 0) | |
146 | gomp_fatal ("Thread attribute set scheduler parameters failed: %s", strerror (err)); | |
147 | err = pthread_attr_setschedpolicy (attr, SCHED_FIFO); | |
148 | if (err != 0) | |
149 | gomp_fatal ("Thread attribute set scheduler policy failed: %s", strerror (err)); | |
150 | err = pthread_attr_setinheritsched (attr, PTHREAD_EXPLICIT_SCHED); | |
151 | if (err != 0) | |
152 | gomp_fatal ("Thread attribute set explicit scheduler failed: %s", strerror (err)); | |
153 | } | |
154 | return attr; | |
155 | } | |
156 | ||
65cb1e66 | 157 | #endif /* GOMP_POOL_H */ |